Electrical resistance



July 23, 1929. s, KEMBLE 1,721,911

ELECTRICAL RES I STANCE Original Filed July 2, 1924 INVENTOR Patented July 23, 1929.

UNITED STATES 1,721,911 PATENT OFFICE.

I THOMAS S. KEMBLE, OF LAKEWOOD, OHIO, ASSIGNOR TO UNIVERSAL GAS ELECTRIC COMPANY, OF LAWRENCE, KANSAS, A CORPORATION OF DELAWARE.

ELECTRICAL RESISTANCE.

Original application filed July 2, 1924, Serial No. 723,770. Divided and this application filed May 5, 1927. Serial No. 188,886.

My invention relates to that class of elec trical resistance which is described in my copending application, Serial No. 723,770, of which this is a division.

It is well known in the art, that when thin wire, or even thin ribbon, is employed, the custom is to wind it upon an insulator. In practice it frequently happens that the in sulator is many times heavier than the resistance, with the result that, when cost and weight are serious factors, such construct-ion is impractical.

My invention has for its object to overcome these difliculties, by mounting the resistance ribbon between insulated local carriers, and

mounting these local carriers in insulated carriers so that no insulation can come into direct contact with the hot resistance.

In the accompanying drawings, which are hereunto annexed and made a part of this specification, I have shown in more or less detail a specific form of embodiment of my iii-- vention, but it is to be understood that these are not to be more than illustrative, and that I do not limit myself to the details thus shown and described, except as such limitations may appear in the hereinafter appended. claims. In the drawings,

Fig. 1 shows a simple form in cross section, in which the continuous crosswise corrugated resistance ribbon. is clamped between discontinuous specially crosswise corrugated carriers and insulated therefrom by a coating of baked enamel on the carriers or by other insulator.

Figs. 2, 3 and a, show in more detail the stamping which is used for carriers in Fig. 1, clamping the crosswise corrugated ribbon at frequent intervals.

Similar reference numerals refer to similar parts throughout the entire description.

As shown in the drawings, my improved form of resistance mounting between insulated discontinuous carriers, in general paral lel to the resistance ribbon.

In this construction, the resistance ribbon 1 is provided with crosswise corrugations 2, giving it a wave form.

A stamping 3 is either insulated or of msulating material, and is so formed that when two of them are reversed endwise and placed one upon the other, the corrugated ribbon 1 may be held between the depressions 4 in the upper stamping 3 and the projections 5 in the lower stamping 3. The method of continuous winding of the resistance ribbon 1 be tween successive stampings 3 is clearly shown in the sectional elevation Fig. 1.

Any desirable number of these stampings 3 may be stacked one over another, according to the construction shown in Fig. 1, with the resistance ribbon 1 wound back and forth as shown. The whole may then be held secure ly together by suitable clamps in a frame 7, to form a resistance unit. The two ends 8 and 9 of the resistance ribbon 1 may be secured to suitable terminals for connection as desired.

From the foregoing description it will be obvious. to persons skilled in the art, that I have in this manner entirely obviated the necessity for bulky, heavy, insulators upon which to mount the resistance, and at the same time have provided a construction in which, although I have the largest amount of radiating surface, it is so arranged as to offer but slight resistance to air, or such other cooling medium as, in practice, it may be found desirable to use.

Having described my invention, what I regard as new, and desire to secure by United States Letters Patent, is:

1. Resistance wire ribbon corrugated crosswise, and corrugated insulated carriers, the corrugations so spaced that they interfit only over portions of their length, the resistance ribbon being clamped between the carriers at the intertitting points only, whereby all the surface of said ribbon is free to radiate heat and is exposed to contact with the air except at the clamping points.

2. Electrical resistance, insulated corrugated carriers on each side of said resistance. said carriers being spaced and provided with interfitting portions, which portions contact the resistance only at such points, and means to clamp said carriers, whereby said resistance is securely held, leaving unobstructed passageway for a cooling medium to pass over the entire surface of said resistance eX- cept where it is held between the corrugated carriers.

3. In combination, resistance ribbon, crosswise corrugated carriers, crosswise corrugated local carries intermediate said carriers, said resistance ribbon being clamped between said carriers at frequent intervals, and insulation arranged between said resistance ribbon and said carriers at thepoints of Contact, said resistance ribbon and said carriers and said insulation being arranged to provide unobstructed passageway for a cooling medium to pass crosswise over the entire surface of said resistance ribbon, except where said resistance ribbon is clamped between said carriers.

4. In combination, crosswise corrugated resistance ribbon, crosswise corrugated carriers, a crosswise corrugated local carrier mounted intermediate said carriers, said carriers being arranged to clamp said resistance ribbon between the projecting corrugation on one carrier and the depression in the corrugations in the adjacent carrier, and insulation arranged betweensaid resistance ribbon and said carriers at the clamping points, said resistance ribbon and said carriers and said insulation being arranged to provide unobstructed passageway for a cooling medium to pass crosswise over the entire surface of said resistance ribbon, except where said resistance ribbon is clamped between said carriers.

5. In combination, resistance ribbon, crosswise corrugated insulated oarriers, and mating carriers mounted intermediate said insulated carriers, said carriers being arranged to clamp said resistance ribbon between the projecting corrugation on one carrier and the depression in the corrugations in the adjacent carrier, said resistance ribbon and said carriers being arranged to provide unobstructed passageway for a cooling medium to pass crosswise over the entire surface of said re sistance ribbon, except where said resistance ribbon is clamped between said carriers.

6. In combination, resistance ribbon, a crosswise corrugated carrier, a second crosswise corrugatedcarrier, a third crosswise corrugated carrier, said resistance ribbon being arranged lengthwise between said first mentioned carrier and one face of said second carrier and around one end of said second carrier and back along the other face of said second carrier between said second carrier and said third carrier, and insulation arranged between said resistance ribbon and said carriers, said carriers being adapted to be held securely together, clamping said resistance ribbon between them at frequent intervals of length of said resistance ribbon.

7. In combination, resistance ribbon, a crosswise corrugated carrier, a second crosswise corrugated carrier, a third crosswise corrugated carrier, said resistance ribbon being arranged lengthwise between said first mentioned carrier and one face of said second carrier and around one end of said second carrier and back along the other face of said second carrier between said second carrier and said third carrier, and insulation arranged between said resistance ribbon anl said carriers, said carriers being adapted to be held securely together, clamping said resistance ribbon between them at frequent in tervals of length of said resistance ribbon, said carriers being formed and arranged with said resistance ribbon and with said insulation to provide unobstructed passageway for a cooling medium to pass crosswise of said resistance ribbon over the entire surface of said resistance ribbon, except at the clamping points where said resistance ribbon is clamped between said carriers.

8. In combination, resistance ribbon, a crosswise corrugated insulating carrier, a second crosswise corrugated insulating carrier, and a third crosswise corrugated insulating carrier, said resistance ribbon being arranged lengthwise between said first men tioned carrier and one face of'said second carrier and around one end of said second carrier and back along the other face of said second carrier between said second carrier and said third carrier, said carriers being adapted to be held securely together, clamp ing said resistance ribbon between said carriers at frequent intervals along the length of said resistance ribbon, said carriers being arranged with said resistance ribbon to provide unobstructed passageway for a cooling mediinn to crosswise of said resistance ribbon over the entire surface of said resistance ribbon, except at the clamping points where said resistance ribbon is clamped between said carriers.

9. In combination, resistance ribbon, a crosswise corrugated carrier, a second crosswise corrugated carrier, a third crosswise corrugated carrier, saio resistance ribbon being arranged lengthwise between said first mentioned carrier and one face of said second carrier and around one end of said second carrier and back along the other face of said second carrier between said second carrier and said third carrier, and insulation arranged between said resistance ribbon and said carriers, said carriers being adapted to be held securely together, clamping said re sistance ribbon between them at frequent intervals of length of said resistance ribbon, said carries being formed and arranged with said resistance ribbon and with said insulation to provide unobstructed passageway for a cooling medium to pass ere: ise of said resistance ribbon over the entire surface of said resistance ribbon, except at the clamping points where said resistance ribbon is clamped between said carriers, said carriers being so formed. that when tw identical carriers are arranged with one reversed endwise relative to the other, said resistance ribbon may be clamped between depression in one of said carriesv and projections of the other of said carriers.

THOMAS S. KEMBLE. 

